Erase default rectangle and create new rectangle in c# windows applica

public partial class Form2 : Form
{
public Form2()
{
InitializeComponent();
}
Rectangle rectangle1;
Pen pen1;
int x = 10, y = 20, w = 100, z = 200;
string whatToDraw=null;
private void button1_Click(object sender, EventArgs e) // draw rectangle with dialog yes/no
{
MessageBoxButtons buttons = MessageBoxButtons.YesNo;
DialogResult result = MessageBox.Show("yes/no", "what", buttons);
if (result == DialogResult.Yes)
{
rectangle1 = new Rectangle(x, y, w, z);
whatToDraw = "Rectangle";
//this.Invalidate();
panel1.Invalidate();
}
else
{
rectangle1 = new Rectangle(1, 1, 699, 699);
whatToDraw = "Rectangle";
panel1.Invalidate();
}
}
private void button3_Click(object sender, EventArgs e)// draw tringle
{
whatToDraw = "Triangle";
panel1.Invalidate();
}
private void panel1_Paint(object sender, PaintEventArgs e) // all shapes
{
switch (whatToDraw)
{
case "Rectangle":
e.Graphics.DrawRectangle(Pens.Black, rectangle1);
break;
case "Triangle":
Point p1=new Point(100,500);
Point p2=new Point(10,300);
Point p3=new Point(60,500);
Point[] points= {p1,p2,p3};
e.Graphics.DrawPolygon(Pens.Black, points);
break;
default:
Console.WriteLine("No match found");
break;
}
} // shapes to draw inside panel
private void button2_Click(object sender, EventArgs e)
{
whatToDraw = null;
panel1.Invalidate();
} // clear panel
}

1 Reply

Know the answer? Post it — somebody with the same question will find it here.

Sachin Singh5y ago
Accepted answer
public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }
        Rectangle rectangle1;
        Pen pen1;
        int x = 10, y = 20, w = 100, z = 200;

        string whatToDraw=null;
        private void button1_Click(object sender, EventArgs e) // draw rectangle with dialog yes/no
        {
            MessageBoxButtons buttons = MessageBoxButtons.YesNo;
            DialogResult result = MessageBox.Show("yes/no", "what", buttons);
            if (result == DialogResult.Yes)
            {
                rectangle1 = new Rectangle(x, y, w, z);
                whatToDraw = "Rectangle";
                //this.Invalidate();
                panel1.Invalidate();


            }
            else
            {
                rectangle1 = new Rectangle(1, 1, 699, 699);
                whatToDraw = "Rectangle";
                panel1.Invalidate();
            }
        }
        private void button3_Click(object sender, EventArgs e)// draw tringle
        {
            whatToDraw = "Triangle";

            panel1.Invalidate();
        }
        private void panel1_Paint(object sender, PaintEventArgs e) // all shapes
        {


            switch (whatToDraw)
            {

        case "Rectangle":
                    e.Graphics.DrawRectangle(Pens.Black, rectangle1);
            break;

        case "Triangle":
                    Point p1=new Point(100,500);
                    Point p2=new Point(10,300);
                    Point p3=new Point(60,500);
                    Point[] points= {p1,p2,p3};
                    e.Graphics.DrawPolygon(Pens.Black, points);
            break;



        default:
            Console.WriteLine("No match found");
            break;
        }
        }  // shapes to draw inside panel



        private void button2_Click(object sender, EventArgs e)
        {
            whatToDraw = null;
            panel1.Invalidate();

        }  // clear panel




    }